I don't recall the use of any concrete, but otherwise you are correct. I used to know some of the guys who developed the thing for TI. They actually only did the guidance kit, but had to simulate the whole thing to check that the control gains from a standard bomb would work, or if they needed to tweak the gains some. The rest of the kit, except for that artillery barrel filled with explosives, was the then in production version of Paveway. I can't recall if they used the gains from the 1000 or 2000 pound version. It was developed in a just few months from contract award to first drop, which hit the desired target.